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nfs-utils-1.1.5-2mdv2009.1.x86_64.rpm

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<H3><A NAME="SECTION00042300000000000000">
Heavy Load</A>
</H3>

<P>
For the heavy load, we set the initial load to 800 and
increment the load by 800 at each run:

<P>
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER">Run</TD>
<TD ALIGN="CENTER"># of Server</TD>
<TD ALIGN="CENTER"># of</TD>
<TD ALIGN="CENTER"># of Processes</TD>
<TD ALIGN="CENTER">Load</TD>
<TD ALIGN="CENTER">Throughput</TD>
<TD ALIGN="CENTER">Response Time</TD>
</TR>
<TR><TD ALIGN="CENTER">&nbsp;</TD>
<TD ALIGN="CENTER">Threads</TD>
<TD ALIGN="CENTER">Clients</TD>
<TD ALIGN="CENTER">Per Client</TD>
<TD ALIGN="CENTER">(Ops/Sec)</TD>
<TD ALIGN="CENTER">(Ops/Sec)</TD>
<TD ALIGN="CENTER">(Msec/Op)</TD>
</TR>
<TR><TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">800</TD>
<TD ALIGN="CENTER">356</TD>
<TD ALIGN="CENTER">56.6</TD>
</TR>
<TR><TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">1600</TD>
<TD ALIGN="CENTER">212</TD>
<TD ALIGN="CENTER">97.8</TD>
</TR>
<TR><TD ALIGN="CENTER">3</TD>
<TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">2400</TD>
<TD ALIGN="CENTER">162</TD>
<TD ALIGN="CENTER">127.5</TD>
</TR>
<TR><TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">3200</TD>
<TD ALIGN="CENTER">138</TD>
<TD ALIGN="CENTER">151.9</TD>
</TR>
<TR><TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">800</TD>
<TD ALIGN="CENTER">569</TD>
<TD ALIGN="CENTER">36.8</TD>
</TR>
<TR><TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">1600</TD>
<TD ALIGN="CENTER">381</TD>
<TD ALIGN="CENTER">54.8</TD>
</TR>
<TR><TD ALIGN="CENTER">3</TD>
<TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">2400</TD>
<TD ALIGN="CENTER">311</TD>
<TD ALIGN="CENTER">67.5</TD>
</TR>
<TR><TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">3200</TD>
<TD ALIGN="CENTER">264</TD>
<TD ALIGN="CENTER">78.6</TD>
</TR>
<TR><TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">800</TD>
<TD ALIGN="CENTER">782</TD>
<TD ALIGN="CENTER">27.4</TD>
</TR>
<TR><TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">1600</TD>
<TD ALIGN="CENTER">594</TD>
<TD ALIGN="CENTER">35.9</TD>
</TR>
<TR><TD ALIGN="CENTER">3</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">2400</TD>
<TD ALIGN="CENTER">494</TD>
<TD ALIGN="CENTER">42.8</TD>
</TR>
<TR><TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">3200</TD>
<TD ALIGN="CENTER">422</TD>
<TD ALIGN="CENTER">49.8</TD>
</TR>
<TR><TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">8</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">800</TD>
<TD ALIGN="CENTER">799</TD>
<TD ALIGN="CENTER">6.9</TD>
</TR>
<TR><TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">8</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">1600</TD>
<TD ALIGN="CENTER">1125</TD>
<TD ALIGN="CENTER">19.4</TD>
</TR>
<TR><TD ALIGN="CENTER">3</TD>
<TD ALIGN="CENTER">8</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">2400</TD>
<TD ALIGN="CENTER">907</TD>
<TD ALIGN="CENTER">23.9</TD>
</TR>
<TR><TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">8</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">3200</TD>
<TD ALIGN="CENTER">775</TD>
<TD ALIGN="CENTER">27.7</TD>
</TR>
<TR><TD ALIGN="CENTER">1</TD>
<TD ALIGN="CENTER">16</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">800</TD>
<TD ALIGN="CENTER">801</TD>
<TD ALIGN="CENTER">6.1</TD>
</TR>
<TR><TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">16</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">1600</TD>
<TD ALIGN="CENTER">1539</TD>
<TD ALIGN="CENTER">14.2</TD>
</TR>
<TR><TD ALIGN="CENTER">3</TD>
<TD ALIGN="CENTER">16</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">2400</TD>
<TD ALIGN="CENTER">1190</TD>
<TD ALIGN="CENTER">18.9</TD>
</TR>
<TR><TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">16</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">3200</TD>
<TD ALIGN="CENTER">967</TD>
<TD ALIGN="CENTER">22.8</TD>
</TR>
</TABLE>
</DIV>

<P>
It is quite clear that under the heavy load, the NFS server performance
benefits tremendously when the number of the server threads was
increased from 1 to 8. When it is above 8, the performance gain was
not as significant as the lower thread count.

<P>
Overall, the SFS benchmarks show that

<P>

<UL><LI>The kernel-space NFS server is a major step forward in the
  	Linux NFS server implementation. Its interoperability and
	performance are way beyond the old NFS server running in
	user-space.

<P>

<LI>The number of kernel NFS server threads will affect the
	server performance. In general, the more, the better.

<P>

<LI>Under the light load, the performance gain from increasing
	the number of server threads is not very significant.

<P>

<LI>Under the moderate load, 8 server threads seem to
	work best for our server hardware configuration.

<P>

<LI>Under the heavy load, the performance gain from increasing
	the number of server threads is significant even
	at 16. However, 16 server threads take significant
	kernel sources.

</UL>

<P>
For our specific server hardware setup, 8 kernel NFS server threads
strike a balance between performance and resource usage.

<P>
To further study the Linux NFS server performance, we need
to run the benchmarks on

<P>

<UL><LI>Different number of CPUs.

<P>

<LI>Different number of SCSI controllers.

<P>

<LI>Different number of harddrives.

<P>

<LI>RAID storage.

<P>

<LI>More RAM.

<P>

<LI>Gigabit Ethernet.

</UL>

<P>
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